main.lyx

CNC 的开放码,EMC2 V2.2.8版

 the same line if both of them use axis words.
 If an axis word-using G-code from group 1 is implicitly in effect on a
 line (by having been activated on an earlier line), and a group 0 G-code
 that uses axis words appears on the line, the activity of the group 1 G-code
 is suspended for that line.
 The axis word-using G-codes from group 0 are G10, G28, G30, and G92.
 
\layout Standard

It is an error to include any unrelated words on a line with 
\family typewriter 
O-
\family default 
 flow control.
\layout Chapter

Order of Execution
\begin_inset LatexCommand \index{G Code Order of Execution}

\end_inset 


\begin_inset LatexCommand \label{sec:Order-of-Execution}

\end_inset 


\layout Standard

The order of execution of items on a line is critical to safe and effective
 machine operation.
 Items are executed in the order shown below if they occur on the same line.
\layout Enumerate

Comment (including message)
\layout Enumerate

set feed rate mode (G93, G94).
 
\layout Enumerate

set feed rate (F).
 
\layout Enumerate

set spindle speed (S).
 
\layout Enumerate

select tool (T).
 
\layout Enumerate

change tool (M6).
\layout Enumerate

spindle on or off (M3, M4, M5).
\layout Enumerate

coolant on or off (M7, M8, M9).
\layout Enumerate

enable or disable overrides (M48, M49).
 
\layout Enumerate

dwell (G4).
 
\layout Enumerate

set active plane (G17, G18, G19).
 
\layout Enumerate

set length units (G20, G21).
\layout Enumerate

cutter radius compensation on or off (G40, G41, G42) 
\layout Enumerate

cutter length compensation on or off (G43, G49) 
\layout Enumerate

coordinate system selection (G54, G55, G56, G57, G58, G59, G59.1, G59.2, G59.3).
 
\layout Enumerate

set path control mode (G61, G61.1, G64)
\layout Enumerate

set distance mode (G90, G91).
 
\layout Enumerate

set retract mode (G98, G99).
\layout Enumerate

home (G28, G30) or change coordinate system data (G10) or set axis offsets
 (G92, G92.1, G92.2, G94).
 
\layout Enumerate

perform motion (G0 to G3, G33, G80 to G89), as modified (possibly) by G53.
 
\layout Enumerate

stop (M0, M1, M2, M30, M60).
\layout Chapter

G Code Best Practices
\begin_inset LatexCommand \index{G Code Best Practices}

\end_inset 


\layout Section

Use an appropriate decimal precision
\layout Standard

Use at least 3 digits after the decimal when milling in millimeters, and
 at least 4 digits after the decimal when milling in inches.
 In particular, arc tolerance checks are made to .001 and .0001 depending
 on the active units.
\layout Section

Use consistent white space
\layout Standard

G-code is most legible when at least one space appears before words.
 While it is permitted to insert whitespace in the middle of numbers, there
 is no reason to do so.
\layout Section

Prefer 
\begin_inset Quotes eld
\end_inset 

Center-format
\begin_inset Quotes erd
\end_inset 

 arcs
\layout Standard

Center-format arcs (which use 
\family typewriter 
I- J- K-
\family default 
 instead of 
\family typewriter 
R-
\family default 
) behave more consistently than R-format arcs, particularly for included
 angles near 180 or 360 degrees.
\layout Section

Put important modal settings at the top of the file
\layout Standard

When correct execution of your program depends on modal settings, be sure
 to set them at the beginning of the part program.
 Modes can carry over from previous programs and from the MDI commands.
\layout Standard

As a good preventative measure, put a line similar to the following at the
 top of all your programs:
\layout LyX-Code

G17 G20 G40 G49 G54 G80 G90 G94 
\layout Standard

(XY plane, inch mode, cancel diameter compensation, cancel length offset,
 coordinate system 1, cancel motion, non-incremental motion, feed/minute
 mode)
\layout Standard

Perhaps the most critical modal setting is the distance units--If you do
 not include G20 or G21, then different machines will mill the program at
 different scales.
 Other settings, such as the return mode in canned cycles may also be important.
\layout Section

Don't put too many things on one line
\layout Standard

Ignore everything in Section 
\begin_inset LatexCommand \ref{sec:Order-of-Execution}

\end_inset 

, and instead write no line of code that is the slightest bit ambiguous.
 Similarly, don't use and set a parameter on the same line, even though
 the semantics are well defined.
 (Exception: Updating a variable to a new value, such as 
\family typewriter 
#1=[#1+#2
\family default 
])
\layout Section

Don't use line numbers
\layout Standard

Line numbers offer no benefits.
 When line numbers are reported in error messages, the numbers refer to
 the line number in the file, not the N-word value.
\layout Section

When moving more than one coordinate system, consider inverse time feed
 mode
\layout Standard

Because the meaning of an F-word in feed-per-minute mode varies depending
 on which axes are commanded to move, and because the amount of material
 removed does not depend only on the feed rate, it may be easier to use
 G93 inverse time feed mode to achieve the desired material removal rate.
\layout Chapter

G Codes
\begin_inset LatexCommand \index{G Codes}

\end_inset 


\layout Standard

G codes of the RS274/NGC language are shown in Table 5 and described following
 that.
\layout Standard

In the command prototypes, the hypen (
\family typewriter 
-
\family default 
) stands for a real value.
 As described earlier, a real value may be (1) an explicit number, 
\family typewriter 
4
\family default 
, for example, (2) an expression, 
\family typewriter 
[2+2]
\family default 
, for example, (3) a parameter value, 
\family typewriter 
#88
\family default 
, for example, or (4) a unary function value, 
\family typewriter 
acos[0]
\family default 
, for example.
\layout Standard

In most cases, if axis words (any or all of 
\family typewriter 
X-
\family default 
, 
\family typewriter 
Y-
\family default 
, 
\family typewriter 
Z-
\family default 
, 
\family typewriter 
A-
\family default 
, 
\family typewriter 
B-
\family default 
, 
\family typewriter 
C-
\family default 
, 
\family typewriter 
U-
\family default 
, 
\family typewriter 
V-
\family default 
, 
\family typewriter 
W-
\family default 
) are given, they specify a destination point.
 Axis numbers are in the currently active coordinate system, unless explicitly
 described as being in the absolute coordinate system.
 Where axis words are optional, any omitted axes will have their current
 value.
 Any items in the command prototypes not explicitly described as optional
 are required.
 It is an error if a required item is omitted.
 In prototypes, this will be written as 
\family typewriter 
\emph on 
axes
\family default 
.
\layout Standard

In the prototypes, the values following letters are often given as explicit
 numbers.
 Unless stated otherwise, the explicit numbers can be real values.
 For example, 
\family typewriter 
G10 L2
\family default 
 could equally well be written 
\family typewriter 
G[2*5] L[1+1]
\family default 
.
 If the value of parameter 100 were 2, 
\family typewriter 
G10 L#100
\family default 
 would also mean the same.
 Using real values which are not explicit numbers as just shown in the examples
 is rarely useful.
\layout Standard

If 
\family typewriter 
L-
\family default 
 is written in a prototype the 
\begin_inset Quotes eld
\end_inset 


\family typewriter 
-
\family default 

\begin_inset Quotes erd
\end_inset 

 will often be referred to as the 
\begin_inset Quotes eld
\end_inset 

L number
\begin_inset Quotes erd
\end_inset 

.
 Similarly the 
\begin_inset Quotes eld
\end_inset 


\family typewriter 
-
\family default 

\begin_inset Quotes erd
\end_inset 

 in 
\family typewriter 
H-
\family default 
 may be called the 
\begin_inset Quotes eld
\end_inset 

H number
\begin_inset Quotes erd
\end_inset 

, and so on for any other letter.
 
\layout Section

Quick Reference Table
\begin_inset LatexCommand \index{G Code Table}

\end_inset 


\layout Standard


\begin_inset  Tabular
<lyxtabular version="3" rows="45" columns="4">
<features>
<column alignment="center" valignment="top" leftline="true" width="0">
<column alignment="center" valignment="top" leftline="true" width="0">
<column alignment="center" valignment="top" leftline="true" width="0">
<column alignment="center" valignment="top" leftline="true" rightline="true" width="0">
<row topline="true" bottomline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

Code
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

Description
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

Parameters
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Section
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

G0
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

Coordinated Straight Motion Rapid
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

n/a
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard


\begin_inset LatexCommand \ref{sec:G0:-Rapid-Linear}

\end_inset 


\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

G1
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

Coordinated Straight Motion Feed Rate
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

n/a
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard


\begin_inset LatexCommand \ref{sec:G1:-Linear-Motion}

\end_inset 


\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

G2, G3
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

Coordinated Helical Motion Feed Rate
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

I J K or R
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard


\begin_inset LatexCommand \ref{sub:G2,-G3:-Arc}

\end_inset 


\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

G10
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

Coordinate System Origin Setting
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

P X Y Z A B C
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard


\begin_inset LatexCommand \ref{sub:G10:-Set-Coordinate}

\end_inset 


\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

G17, G18, G19
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

Plane Select
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

n/a
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard


\begin_inset LatexCommand \ref{sub:G17,-G18,-G19:}

\end_inset 


\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

G20, G21
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout S